#include <REGX52.H>

void Delay1ms(unsigned int xms)
{
	unsigned char i,j;
	while(xms)
	{
		i=2;
		j=239;
		do
		{
			while(--j);
		} while(--i);
		xms=xms--;
  }
}
void main()
{
	while(1)
	{
		P2=0xFE;//1111 1110
		Delay1ms(500);
		P2=0xFD;//1111 1101
		Delay1ms(500);
		P2=0xFB;//1111 1011
	  Delay1ms(500);
		P2=0xF7;//1111 0111
		Delay1ms(500);
		P2=0xEF;//1110 1111
    Delay1ms(500);		
		P2=0xDF;//1101 1111
		Delay1ms(500);
		P2=0xBF;//1011 1111
		Delay1ms(500);
		P2=0x7F;//0111 1111
		Delay1ms(500);
	}
}
